Water-tube boiler.



w D. GEESTER.

WATER TUBE BOILER.

APPLICATION FILED MAY 31, 1911.

1 9 l 2%,3-92. ateated Jan. 12, 1915.

Unrrnn s'rarns PATENT omen.-

WIIFRED D. CHESTER, F SEWICKLEY, PENNSYLVANIA, ASSIGNOB TO THE BAIBCOGKrB WILCQX COMPANY,

OF BAYONNE, NEW FEESEY, A COR-PQRATION 015 NEW JERSEY.

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Specification of Letters Patent. Pat t d J 12 1915 Application filed. May 31, 1911. Serial N o. 830,476.

a citizen. of the United States, residing at gewickley, in the county of Allegheny and btate of Pennsylvania, have in tented certain new and useful Improvements in Water-Tube Boilers.

of which the following is a specification.

The object of the present invention is to provide means for the economic renewal of those tubes of a water tube boiler which are directlyexposed to the heat of the furnace gases, and it will be understood by reference Lo the accompanying drawings in which Figure 1 is a longitudinal section through a boiler showing the adaptation of my invention thereto; Fig. 2 a view showing a sli ht modification, and Fig. 3 a detail view.

imilar reference'numerals indicate similar parts in the several views.

" The standard type of boiler shown in Fig.

. 1 comprises a'bank of inclined water tubes It connected to uptake and downtake headers 2 and '3, respectively. The bank is divided intothr ee vertical passes by battles d and '5,

the former in contact with the bridge wall 6 of the furnace 7. The gases from the furnace flow upwardly through the first pass at the uptake end of the tubes, downwardly through the second pass, and then upwardly through the third pass to the stack outlet.

It has been the practice heretofore to use tubes extending from the uptake to the clowritake header. The tubes of the lowermost row, being those subjected to the direct heat of the furnace gases, are the first to deteriorate and theirrenewal requires the removal of the entire tube, although the portion of the tube back of the'bridge wall may be in good condition. To minimize the 130st of tube renewals I have suggested various expedients di closed in applications filed of even date herewith. In the present arrangement I use short tubes for the lower row ofthe bank extending from the uptake headers to a point beyond the bridge wall and there connecting them through boxes and other short tubes to the downtake headers Thus, in Fig. 1, the tubes 8 of the lowermost row extend from the uptake header '2 to apoint back of the bridge wall where they are expanded into a box 9. This box is nippledto a box 10, which, in turn,

take headers 8. The boxes 9 and 10.1nay

be installed as units or in sections, a hand hole cap 12 being placed opposite each tube end, the bridge wall being so designed, and the boxes placed in such position as to admit the use of an expander for'all joints. Also as shown, the bridge wall 6 extends upwardly to the short tube lengths 8 and is immediately below the transverse bafile 4. I

The slight modification shown in Fig.72 consists in len thening the nipple 13 con nectlng the two boxes 9 and 1( and placing it in a substantially vertical position, and using substantially straight tubes 14 between the box 10 and the rear header 3, these tubes-being bent only at their point of connection with said header. With this arrangement, as in others proposed by me, short tubes may be used for the, lower row. Not only does this minimize the cost of tubes which require most frequent renewal, but,,in the renewing, there is no disturbance of the rear bafile 5-. This is because of the termination of the tubes 8 pass.

'What I claim and desire to secure by Letters Patent of the United States is:

1. A water tube boiler comprising a bank of inclined generating tubes, uptake and downtake headers into which said tubes are expanded, a furnace below the uptake ends of the tubes, a bridge wall for said furnace extending upwardly to the lowermost row of tubes of the bank, said lowermost row consisting of short tube lengths extending from the uptake header'to a point immediately back of the bridge wall, a transverse box to which the ends of said tubes are connected, a second transverse box below and nippled to the first named box, and tubes connecting said second named box'with the downtake headers, said boxes being pro: vided with hand hole fittings opposite the tube ends for accessibility to the tubes and for use inexpand'irg the tubes.

2-. A water tube boiler comprising a bank of inclined generating tubes, uptake and at a point in the second downtake headers into which said tubes are exten aihg the uptake headerto i tubes 'and' for. use inexpafiding ithehipes,

' 93:15 waterwt'ubeq-bdilef; comprising bank' of'. inclined generatingtubes fuptake are'fexpandeiiag furnacebelbiv :thef uptake" ends 9f the tubes; all bridge well?" for- $94M; 'furna'ee-extending. u' wardly-izo thelower xm'ost raw of .tubeeo llthebainkgrsaid-lowel u i f h t xubwn 'zh extending from-the uptake h a apomgk ,i mediutely'baekefthe bridg w afi 'en are. eonnepted a fsecpnd transverse 00x nip:

' plea 'to the first-gamed box, and .tubes flconnectingvsaid bxes with; the -,bb i 1er ,eirculaition, saidigboxes being provided with 'hand hele fittings jofpposite .the' tube ends for 1.16; gessibilityfltothe tubes and-for use in' ex l-Dandingithetubes;

[immediately back oft I .yz sseboxto-whicli' heendsbfi and u e m, I qbonnected ga second transverse b0 nipple}! the first transversehaflievtheiowermost POW of. said; bank eonsisting of .Shoxrttuberlex'igths extendingfrom the minke-header to-.a .-p0int ,br idg e ,-walka;flmna 1n said;fbeies with the boiler, cireul atiomi 521d, boxes' being- '1'0vjded".with hand bole fittings, pppesite i: e ftube ends" i0! 180C888].- 'bility'td the pubee z md' $01 pse in expeedin g ,the tubes:

I-n' testimony whereof II have hefefi ntd signed my na llein, the presence of ,twq' subscribing wltnesses :Witnessesr Q I HENRY, B'. RUST, ALICE A. TRILL.

WnwRE -p; CHESTER. 

